[[File:Madam Rosmerta - 1993.jpg|thumb|left|150px|Rosmerta outside her pub in the snow in [[1993]].]]

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[[File:Madam Rosmerta - 1993.jpg|thumb|left|150px|Rosmerta outside her pub in the [[Water|snow]] in [[1993]].]]

{{Quote|Naturally. Never saw one without the other, did you? The number of times I had them in here -- ooh, they used to make me laugh. Quite the double act, Sirius Black and James Potter!|Rosmerta mentions that she was barmaid when James and Sirius visited the pub.|Harry Potter and the Prisoner of Azkaban}}

{{Quote|Naturally. Never saw one without the other, did you? The number of times I had them in here -- ooh, they used to make me laugh. Quite the double act, Sirius Black and James Potter!|Rosmerta mentions that she was barmaid when James and Sirius visited the pub.|Harry Potter and the Prisoner of Azkaban}}

In 1997, however, it emerged that Rosmerta had become an unwilling agent of the Death Eaters. In order to fulfil his mission to assassinate Albus Dumbledore, Draco Malfoy had managed to place Rosmerta under the Imperius Curse. He used her to pass on a cursed opal necklace to Hogwarts student Katie Bell, who accidentally touched the necklace and was herself subjected to the very harmful curse intended for the Headmaster. Rosmerta also poisoned mead that was intended to be given to Dumbledore through Horace Slughorn in the guise as a Christmas present, but it was unintentionally drunk by Ron Weasley, who was saved by Harry Potter's quick thinking; Harry had shoved a Bezoar down Ron's throat to save his life. Malfoy communicated with Rosmerta through fake galleons like the ones Hermione Granger used for Dumbledore's Army.

After Harry and Dumbledore had been to the cave to retrieve a locket they believed to be one of Voldemort's Horcruxes, they apparated to Hogsmeade, where Madam Rosmerta alerted them to the presence of the Dark Mark above the school and gave them brooms on which they could travel rapidly back to Hogwarts, where Draco's plan could be brought to completion. Harry Potter eventually cleared her name as he felt that that investigation on Albus Dumbledore's death may link to her.

Rosmerta is an attractive woman, described as "a curvy sort of woman with a pretty face". On one occasion, she was seen wearing glittery high-heels. Several Hogwarts pupils, including Ron Weasley, have fancied her.

Behind the scenes

Madam Rosmerta was portrayed by British actress Julie Christie in the film adaptation of Harry Potter and the Prisoner of Azkaban. She only appears twice in the film; once at the Three Broomsticks and again, on close observation, when Harry and Hermione go back in time. Her role was reduced to this film alone as she did not appear in any of the subsequent film adaptations of the novels.